Sump Pump systems are used in a variety of applications, mainly for pumping water out of flooded basements. A sump pump is used to keep water out of a basement or crawl space, especially a foundation below the water table. A properly installed sump pump system will keep basements dry and free of moisture. Sump pump systems are necessary for houses with foundations below the water table to keep them free of moisture. Sump pumps are available as submersible or pedestal models. Another use for sump pumps are in water garden applications to move water to different areas or pools within the garden system. A sump pump with a float valve switch in a garden application keeps your pump from burning out due to loss of water from evaporation.